The relative atomic mass of tellurium is 128 and the relative atomic mass of iodine is 127, but iodine appears after tellurium in the modern periodic table.
State why iodine is placed after tellurium in the periodic table.
80 exam-style questions on Edexcel GCSE Chemistry 2.2 The periodic table, covering 2.2.1 Mendeleev's periodic table, 2.2.2 Periods, groups, metals and non-metals, and 2.2.3 Electronic configuration and position in the periodic table. Each one has a worked solution and a mark scheme showing where the marks go.